s1=[1,2,3]
s2=[1,2,3]
print(id(s1))
print(id(s2))
print(s1 is s2)
print(s1 == s2)
s1='AK'
s2='AK'
print(id(s1))
print(id(s2))
print(s1 is s2)
print(s1 == s2)

s1=100
s2=100
print(id(s1))
print(id(s2))
print(s1 is s2)
print(s1 == s2)

s1={'a':1,'b':2}
s2={'a':1,'b':2}
print(id(s1))
print(id(s2))
print(s1 is s2)
print(s1 == s2)
print({'a':1,'b':2}=={'a':1,'b':2})
print({'a':1,'b':2} is {'a':1,'b':2})